A complete bypass of eMudhra’s 1FA OTP login system

163 pointsposted 8 hours ago
by tensegrist

41 Comments

bragr

7 hours ago

The anti AI scraping on this site doesn't work that well. I'm being served non-sense text about buttplugs. I'm human, I swear.

Muromec

7 hours ago

That was proof of soul check and you passed

doubled112

6 hours ago

That's what comes after the verification can.

ronsor

5 hours ago

anti-AI scraping is often anti-privacy in practice, as any effective implementation requires invasive browser inspection to detect scrapers.

esseph

3 hours ago

The web is for bots now. Humans are the minority and will get pushed out, or leave in the face of various pending identity verification schemes to get past the bot filters.

paimapi

6 hours ago

that's actually the exploit, it was very physical

nathancahill

6 hours ago

We're living in a South Park episode.

jttnr

6 hours ago

Oh man, good that they are leaving the CA business.

https://news.ycombinator.com/item?id=50195110

chrisjj

6 hours ago

That has no effect, since the'd get no such business from now.

What's sad it they won't be taking their certs with them. Let's hope the powers up the chain conduct some deep self-refection on their part in thus fiasco.

dualvariable

5 hours ago

> Let's hope the powers up the chain conduct some deep self-refection on their part in thus fiasco.

that almost never happens.

stop hoping corporations grow a soul and a conscience.

Georgelemental

5 hours ago

Who said anything about soul or conscience? Getting hacked doesn't deliver value for shareholders

greenavocado

4 hours ago

> stop hoping corporations grow a soul and a conscience.

stop anthropomorphizing social constructs (corporations). corporations are run by humans. it is the humans running them that lack conscience and a soul.

ProllyInfamous

4 hours ago

In America, Corporations are people, too (for serious, see Citizens United SCOTUS ruling).

But corporately-suited Homo sapiens* should definitely be held criminally liable for much of their intentional shenanigans...

ignatella

6 hours ago

I understand it in the following way:

They put the public key into js and encrypt the body of the request. This is common practice to protect users' important data from being accessed by a proxy (in this case, Cloudflare) and is ok.

But the real bug is that they don't rate-limit, invalidate, or protect the endpoint related to OTP checks, so it can be brute-forced, as the search space is limited.

ignatella

6 hours ago

so not sure why the author shows us the public key

hoherd

7 hours ago

The number the tool found was 1861. The e-mailed OTP code was 1858. What am I missing?

molticrystal

7 hours ago

I noticed that as well. Figured it was a concurrency issue, and they have a follow-up message that you can see if you click on the OP of the Mastodon thread that confirmed my guess: https://mastodon.catgirl.cloud/@49016/117476097901925573

>(yes the code is off by a few. its bc the poc is shit and to speed it up it uses 8 connections at the same time. it just stops the counter once it has a hit so its off by ~4 lmfao. you could easily fix this but cba today)

buildbot

7 hours ago

So basically anyone who used this CA is screwed if someone knows your email?

gruez

7 hours ago

Only if they're lazy and went with the "download key and certificate (and we'll generate the keys for you)" option. Otherwise at least how it's supposed to work is that you give a CA a certificate signing request (CSR) containing your public key, they sign it and hand back your certificate. The certificate itself doesn't contain anything sensitive, because it's the same thing that your server presents to clients. But people are lazy and might not know how to generate a csr locally, hence the aforementioned option. And of course if they're too lazy to generate a csr locally, they're probably also too lazy to keep backups, so you can be sure that eMudhra keeps a copy in case they deleted it from their downloads folder.

pdpi

6 hours ago

With this exploit, what's stopping me from sending my own CSR for your domain?

skeledrew

an hour ago

I guess certs isn't the only thing they'll be exiting.

tommica

7 hours ago

Could someone explain this? Does this mean that it enables logging in as any account in emudhras infra?

cyberpunk

6 hours ago

Yes, it’s a complete auth bypass. All you need is the email address of a user and they’ll likely sign CSRs for any domains under that account.

It’s the end for them, I imagine.

greenavocado

4 hours ago

Cut the undersea cables already

ProllyInfamous

4 hours ago

I gave up cell phone service a few years ago (mid-sized USA city).

This seems less-and-less extreme, daily. Free yourselves from your leashes!

----

Next time you're standing in line, strike up conversation (about anything) with your ugliest linemate (it doesn't even matter about what, just offline communication)...

Maybe ya'll both like ZFS or "heard about that PHP thing!?" (I used both conversation starters, today – it worked – I can be the ugliest, too).

danielbln

32 minutes ago

Please don't, not everyone appreciates small talk.

FLeXMurphy

7 hours ago

Security represents less than 1% of their business.

lenerdenator

6 hours ago

Aye, but it'll now represent much, much more than 1% of their corporate reputation.

chrisjj

6 hours ago

Purported security, you mean.

Actual security, add some zeros ;)

cyberpunk

7 hours ago

Don't piss off the internet, there will be consequences. I guess.

VladVladikoff

7 hours ago

Hahahahha what a roast. Too funny, especially the "4 Bars" in the background of the demo.

trallnag

5 hours ago

Damn, these Mastodon accounts are a rabbit hole to get lost in

gilrain

7 hours ago

This site serves me garbage. Iocaine, I think? I use Brave.

"If you are not [a bot], and you feel you have been served garbage by mistake, please contact the owner of the site you're visiting."

If anyone knows another way to access the content, I'd be interested. No contact details are offered and visiting mastodon.catgirl.cloud resets my connection.

jwilk

5 hours ago

You can use https://github.com/jwilk/zygolophodon to read Mastodon posts in your terminal:

  $ zygolophodon --with-ancestors https://mastodon.catgirl.cloud/@49016/117475976434068995

fc417fc802

5 hours ago

Doesn't that also fetch the content directly? So depending on the logic of the filter it likely won't make any difference.

jwilk

5 hours ago

It uses the API, which hopefully is protected from bots less fiercely.

fc417fc802

5 hours ago

Ah yes, adopting the standard cloudflare approach. "Contact the site administrator to resolve this" but no contact details are provided.

baal80spam

6 hours ago

"S" in "eMudhra stands for "Secure".

EQYV

7 hours ago

Please can this not be true..